C# tutorial- Expressions and Operators

C# Expressions and Operators



The ability of a programming language to perform calculations or operations is perhaps the most important one. To do operations on values, operators are needed.

-Assignment operator (=)


Assignment operator is used to assign a value to a variable;
int x;
int y;
x=10;
y=x;

-Arithmetic operators (+, -,*, /, %)

Arithmetic operators are used to perform arithmetic operations on variables.

Sign

Meaning

+

Addition

-

Subtraction

*

Multiplication

/

Division

%

Division of modulus

int x;
int y;
int z;
int a;
int m;
x=10;
z=y+x;
a=z-(y=5);
m=a%y;

-Compound assignation operator (+=, -=, *=, /=, %=, <<=, >>=, &=, |=, ^=)

Compound assignation operator is used to perform operations (+, -, *, /,…) on variables with assignment operation.

Operator

Example

Equal to

+=

i+=1

i=i+1

-=

i-=1

i=i-1

*=

i*=2

i=i*2

/=

i/=2

i=i/2

%=

i%=2

i=i%2

<<=

i<<=2

i=i<<2

>>=

i>>=2

i=i>>2

&=

x&=3

x=x&3

|=

x|=y

x=x|y

^=

x^=y

x=x^y

-Comparison Operators (==, >, <, >=, <=,!=)

Comparison operators are used to compare variables. They return a Boolean value (true or false).

Operator

Meaning

Example

==

Equal to

(x==y)

> 

Greater than

(x>y)

< 

Less than

(x<y)

>=

Greater than or equal

(x>=y)

<=

Less than or equal

(x<=y)

!=

Not equal to

(x!=10)&&(y!=10)

 

-Increment and Decrement operators (++, --, ++, --)

These operators are used to make increment or decrement on a variable.

Operator

Example

Equal to

++

x=++i

x=i+1

i=i+1

--

x=--i

x=i-1

i=i-1

++

x=i++

x=I

i=i+1

--

x=i--

x=I

i=i-1

-Logical Operators (&&, ||, !)

Logical operators are used to evaluate two expressions and return one result.

Operator

Meaning

Example

&&

And

(x>y)&&(y<z)

||

Or

(x>y)||(x<3)

!

Not

!(x==y)

-Bitwise operators (~, |, &, <<, >>, ^)

Bitwise operators are used to modify bits that represent the values that they store.

Operator

Meaning

Example

~

Reverse bits

x=~2 (result: x=-3)

|

Or

y=2|3(result: y=3)

&

And

y=2&3(result: y=2)

<< 

Shift bits to the left

y=5<<2 (result: y=20)

>> 

Shift bits to the right

y=5>>2(result: y=1)

^

Excusive Or(XOR)

y=2^3(result: y=1)




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comment

Posted comments

Phan Neth, CICI, year 3:

Now it is ok teacher. I can connect to database and select data from it. Than you so much teacher !!!!!

04-30-2013

Dara:

Copy and paste the link below to the address box to learn how to connect C and Mysql server:
http://www.worldbestlearningcenter.com/index_files/cpp-tutorial-connect_mysql_database.htm

04-27-2013

Phan Neth, CICI, year 3:

Hello teacher i want to connect C programming language to MySql server but it have problem. When i compile it always error with library " my_global.h
and mysql.h", so how should i do?

04-27-2013

Phan Neth, Year 3 at CICI,:

I have some problem about connection to mysql server. So I hope teacher can help me. Thank !!!!

04-26-2013

Federico:

Output appears the same also this way:

static void Main(string[] args)
{
int[,] myArray = new int[5, 5];
int row, i;
int n = 1;

for (row = 0; row < 5; row++)
{
for (i = 0; i < 5; i++)
{
myArray[row, i] = n;
if (row == 1 && i == 2) Console.Write(" \t");
else Console.Write("{0} \t", n);

if (n!=26) n++;
if((i+1)%5==0) Console.WriteLine("\n");
}
}
Console.ReadLine();
}

04-13-2013

Dara:

Let pointer p point to the index 1 elem (value=2) of the array.
int *p= a+1;
Let pointer q point to the index 6 elem (value=5) of the array.
int *q= a+6;
-Expression q-p is the subtraction of address of the index 6 element and the address of index 1 elem of the array. So, the result is 5.
-Expression *p+*q is the sum of the value of index 1 elem (2) and the value of index 6 elem (5). So, the result is 7.
In conclusion, the output is 57.

03-28-2013

Anushka :

Find the output of following code
main()
{
int a[] = {1,2,9,8,6,3,5,7,8,9};
int *p= a+1; int *q= a+6;
cout<< q-p <<*p+*q; }

03-28-2013

Dara:

Option Explicit
Dim Cn as New ADODB.Connection
Private Sub_Form_Load()
Cn.Open "Provider=SQLOLEDB; Data Source=ServerName; Initial Catalog=DatabaseName;UserID=UserName; Password=Passw"
End Sub
You will need to replace ServerName with the name of your server (installed SQL Server), DatabaseName withe the name of your data file that you want to connect to, UserName with the name of the user to login to SQL Server, and Passw with the password used to login to SQL Server.

03-13-2013

More>>>

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